Digest for sci.electronics.repair@googlegroups.com - 10 updates in 5 topics

Jeff Liebermann <jeffl@cruzio.com>: Nov 12 11:06PM -0800


>What is the color code for a -10 ohm resistor.
>That's a NEGATIVE 10 ohm resistor, not a standard (positive) 10 ohm
>brown-black-black resistor. (Thats 10 ohms below zero ohms).
 
Are you perhaps thinking of reactance, which is some value multipled
by sqrt(-1)? Inductors and capacitors are normally not marked with
their reactance values because it varies with frequency.
 
Another possibility is that you have inserted the battery in your
ohms-guesser backwards, and are therefore producing negative
resistance readings. If not the battery, then perhaps the meter leads
have been reversed.
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
John Larkin <jjlarkin@highlandtechnology.com>: Nov 13 07:56AM -0800

On Sun, 12 Nov 2017 23:06:30 -0800, Jeff Liebermann <jeffl@cruzio.com>
wrote:
 
>ohms-guesser backwards, and are therefore producing negative
>resistance readings. If not the battery, then perhaps the meter leads
>have been reversed.
 
I built a -1K resistor once, as a school project. It was fun to play
with in various circuits. Voltage dividers with gain, positive
exponential time constants, things like that.
 
 
 
 
--
 
John Larkin Highland Technology, Inc
 
lunatic fringe electronics
"pfjw@aol.com" <pfjw@aol.com>: Nov 13 06:25AM -0800

These are PM speakers and may be replaced with about any inexpensive PM speaker that will fit. For the most part, they were the cheapest available to begin with, and may be replaced with the cheapest available now. Go to your local auto-supply and find some cheap, small speakers. They will do fine. Emphasis on CHEAP. Or go to any on-line dealers and purchase there.
 
http://www.cablesandconnectors.com/07000-07.HTM
 
One of dozens of suppliers.
 
Peter Wieck
Melrose Park, PA
"pfjw@aol.com" <pfjw@aol.com>: Nov 13 06:33AM -0800

The RMA is probably older than you are - as difficult as that may be to believe. There is not and never has been any 'confusion' between parts, parts suppliers or any other aspect related to the manufacturing of radios since the inception of the RMA - and that was conceived to prevent such confusion. In 1924. Parts have been standardize since then.
 
Peter Wieck
Melrose Park, PA
Foxs Mercantile <jdangus@att.net>: Nov 13 08:44AM -0600

>> mill AA5?
 
> I dont recall saying that. Maybe you need a reading
> comprehension course.
 
You may not have said it, but you certainly act like it.
It doesn't matter what we tell you, you always have to argue
about it.
 
>> First off, a 10,000 pf Micamold is a paper cap, not a mica.
 
> That's deceiving. It's called a MICAmold. That would tell me
> that it's a MICA cap.
 
Here we go again. See above.
They're called micamold because that's the name of the company that
manufactured them.
They also made paper dialectric caps that were made to like huge
variations of the standard postage stamp micas. A marketing ploy
at the time to suggest that THEIR crap was as stable and long life
as mica. Hint: They weren't.
 
You're a piss poor survivalist if you can't pay attention and learn
from others.
 
 
--
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com
Frank <analogdial@mail.com>: Nov 13 03:15PM

On Sun, 12 Nov 2017 14:46:06 -0600, Foxs Mercantile wrote:
 
>> serviceman a few decades ago.
 
> Any "technician" that would clip a part, and leave it hanging, rather
> than replace it is NOT an experienced serviceman. He's a hack.
 
OK, he's an experienced hack. I'm sure more than one serviceman was
snipping out potentially troublesome, yet non-essential, caps back in
yesteryear.
 
And I'm sure some customers back then would call the BBB, if not the
State's Attorney, if the radio repair man replaced a cap before it had
gone up in smoke.
Phil Allison <pallison49@gmail.com>: Nov 13 03:06AM -0800

Some loopey Old Fart posted:
 
-----------------------------
> If you collect radios and have more than 10 radios, this is the
> solution:
 
> http://78.media.tumblr.com/971e9154425b73a47b8e28ede4a2fb60/tumblr_inline_mrnnt99phm1qz4rgp.png
 
** He must be the idiot who called out:
 
"Friends, Romans, countrymen - lend me your ears ..... "
 
 
 
 
..... Phil
tabbypurr@gmail.com: Nov 13 06:58AM -0800

> solution:
 
> http://78.media.tumblr.com/971e9154425b73a47b8e28ede4a2fb60/tumblr_inline_mrnnt99phm1qz4rgp.png
 
> (Now you can listen to ALL of them at once) !!! :)
 
I'm all ears
 
 
NT
tabbypurr@gmail.com: Nov 13 06:56AM -0800

On Sunday, 12 November 2017 23:01:09 UTC, bitrex wrote:
> glow visibly. Probably in the 1960s not everyone could afford a VTVM or
> a bench supply that also had a current meter, and the filament
> resistance might be too high to trigger some simple basic continuity testers
 
Certainly a waste of $3 though. Before my first multimeter I had a torch bulb in calipers that made testing batteries, switches etc easy.
 
 
NT
oldschool@tubes.com: Nov 13 12:37AM -0600

On Sun, 12 Nov 2017 10:35:00 -0500, Michael A Terrell
>> Why does it seem there are no posts any more ???
 
>Pay for it, you cheap bastard. It isn't worth watching, or they would be
>broadcasting it.
 
This piece of worthless rubbish was posted to almost every newsgroup on
usenet a few days ago.
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